Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é o menor valor de empates com 21 pontos?
 ###Tabelas: CREATE TABLE compilations (compilations_id AUTO_INCREMENT PRIMARY KEY, Year INT, Tracks VARCHAR, Title VARCHAR, Format, Special Notes VARCHAR, Label VARCHAR) CREATE TABLE major_competition_record (major_competition_record_id AUTO_INCREMENT PRIMARY KEY, Year INT, Competition VARCHAR, Venue VARCHAR, Position VARCHAR, Notes VARCHAR) CREATE TABLE torneo_apertura (torneo_apertura_id AUTO_INCREMENT PRIMARY KEY, Position INT, Team VARCHAR, Played INT, Wins INT, Draws INT, Losses INT, Scored INT, Conceded INT, Points INT) CREATE TABLE by_electorate (by_electorate_id AUTO_INCREMENT PRIMARY KEY, Region VARCHAR, Enrolled men INT, Enrolled women INT, Enrolled total INT, Men of voting age INT, Women of voting age INT, Voting age population INT, E/VAP ratio Men VARCHAR, E/VAP ratio Women VARCHAR, E/VAP ratio Total VARCHAR) CREATE TABLE current_members (current_members_id AUTO_INCREMENT PRIMARY KEY, Institution VARCHAR, Location VARCHAR, Founded INT, Type VARCHAR, Enrollment INT, Nickname VARCHAR, Joined VARCHAR)  
SELECT MIN Draws FROM torneo_apertura WHERE Points = 21